US4327176A - Dry image forming material - Google Patents

Dry image forming material Download PDF

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Publication number
US4327176A
US4327176A US06/203,034 US20303480A US4327176A US 4327176 A US4327176 A US 4327176A US 20303480 A US20303480 A US 20303480A US 4327176 A US4327176 A US 4327176A
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Prior art keywords
image forming
forming material
weight
dry image
monomer units
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Ryo Matsui
Tadao Matsushika
Yoshio Hayashi
Tetsuo Shiga
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Asahi Kasei Corp
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Asahi Kasei Kogyo KK
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Assigned to ASAHI KASEI KOGYO KABUSHIKI KAISHA reassignment ASAHI KASEI KOGYO KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HAYASHI YOSHIO, MATSUI RYO, MATSUSHIKA TADAO, SHIGA TETSUO
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/494—Silver salt compositions other than silver halide emulsions; Photothermographic systems ; Thermographic systems using noble metal compounds
    • G03C1/498—Photothermographic systems, e.g. dry silver
    • G03C1/49836—Additives
    • G03C1/49863—Inert additives, e.g. surfactants, binders
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/14—Dimensionally stable material

Definitions

  • the present invention relates to a dry image forming material. More particularly, the invention relates to a dry image forming material which contains a high impact or impact strength-improved acrylic resin as a binder material of an image forming coating or layer and/or a material of any protective layer, and which has improved adhesion of the image forming coating to a support and/or said any protective layer, resistance to blooming or chalking, and storage stability before use thereof.
  • a dry image forming material which contains a high impact or impact strength-improved acrylic resin as a binder material of an image forming coating or layer and/or a material of any protective layer, and which has improved adhesion of the image forming coating to a support and/or said any protective layer, resistance to blooming or chalking, and storage stability before use thereof.
  • image forming materials capable of forming thereon an image only according to a dry process
  • image forming materials there are, for example, image forming materials using an oxidation-reduction image forming combination comprising a nonphotosensitive organic silver salt oxidizing agent such as the silver salt of a long chain fatty acid, saccharin or benzotriazole with a reducing agent for silver ions, a photosensitive compound such as a silver halide or a photosensitive compound forming-component capable of performing as a photosensitive catalyst, and the like.
  • image forming materials are characterized in that they can be developed by heating.
  • the dry image forming materials of the silver salt type include those containing a photosensitive silver halide which are photosensitive under normal lighting conditions (hereinafter often referred to as "normally photosensitive image forming material”), such as disclosed in U.S. Pat. Nos. 3,152,904 and 3,457,075, and those which are non-photosensitive under normal lighting conditions (hereinafter often referred to as "normally non-photosensitive image forming material”), such as disclosed in U.S. Pat. Nos. 3,764,329, 3,816,132, 4,113,496, and 4,173,482.
  • the latter image forming materials can be handled under room light, provided they are not activated, and can be rendered photosensitive when they are activated, for example, by heating the same prior to exposure to light.
  • the former image forming materials can form thereon a visible image when subjected to imagewise exposure to light and subsequent heat development, whereas the latter image forming materials can form thereon a visible image when subjected to preliminary activation, imagewise exposure to light and subsequent heat development.
  • a dry image forming material of the silver salt type as mentioned above is usually heat-treated at a temperature ranging from about 60° C. to about 180° C.
  • a temperature ranging from about 60° C. to about 180° C. By the heat treatment, some thermal strain is caused in the image forming coating or layer and any protective layer of the image forming material which contain as the binder material a polymer such as polymethyl methacrylate, polystyrene, cellulose acetate or a vinyl chloride-vinyl acetate copolymer, and, in most cases, the deterioration of the polymer is accelerated by any light-or heat-decomposition products of ingredients contained in the coating or layer, leading to decreased adhesion of the image forming coating to a support thereunder and/or said any protective layer thereon, which often results in some peeling therebetween.
  • the image forming material often brings about blooming or chalking which is such a phenomenon that some ingredients or additives such as a toning agent come up or rise, in the form of a powder in the case of chalking, onto the surface of the image forming material.
  • this kind of dry image forming material is defective in that the storage stability of the raw image forming material prior to use thereof for image formation is unsatisfactory.
  • this kind of image forming material is fatally defective in that the adhesion of the image forming coating to the support is so poor that peeling is liable to readily occur therebetween when the image forming material undergoes strong impact (impact peeling strength can be examined by the Du Pont impact test which will be detailed later).
  • a dry image forming material comprising (a) a non-photosensitive organic silver salt oxidizing agent, (b) a reducing agent for silver ions, (c) a photosensitive silver compound or a photosensitive silver compound-forming component capable of forming a photosensitive silver compound by the reaction thereof with said organic silver salt oxidizing agent (a), and (d) a high impact or impact resistance-improved acrylic resin having an Izod impact strength (notched) of at least 0.4 ft.lb/in as measured in accordance with ASTM D 256.
  • the image forming coating or layer which may be made either of a single layer comprising the components (a), (b) and (c) or of a plurality of separate layers each containing at least one of the components (a), (b) and (c), contains, in at least one layer thereof, the component (d), i.e. the high impact or impact resistance-improved acrylic resin.
  • the component (d) is contained in a layer containing the component (a), i.e. the organic silver salt oxidizing agent, and/or in any layer formed just on said layer containing the component (a) and preferably containing the component (b), i.e. the reducing agent for silver ions, and/or a toning agent.
  • the improvement in impact peeling strength achieved by the image forming material of the present invention may be attributable to the shock-absorbing effect of the high-impact or impact resistance-improved acrylic resin (d) which may be a blend of at least one rigid thermoplastic acrylic polymer and at least one rubber-elastic polymer, or at least one copolymer comprising rigidity-providing acrylic monomer units and rubber elasticity-providing monomer units or a combination thereof with at least one rigid thermoplastic acrylic polymer and/or at least one rubber-elastic polymer.
  • the high-impact or impact resistance-improved acrylic resin (d) which may be a blend of at least one rigid thermoplastic acrylic polymer and at least one rubber-elastic polymer, or at least one copolymer comprising rigidity-providing acrylic monomer units and rubber elasticity-providing monomer units or a combination thereof with at least one rigid thermoplastic acrylic polymer and/or at least one rubber-elastic polymer.
  • the rubber-elastic polymer and/or the rubber elasticity-providing monomer units will give the resin (d) such flexibility or deformability that the resin (d) can moderate the shock of impact when the image forming material is subjected to strong impact.
  • the improvement in storage stability achieved beyond our expectation by the dry image forming material of the present invention is believed to be attributable to an excellent affinity of the high impact or impact resistance-improved acrylic resin (d) for various components or additives such as a reducing agent (b) and any toning agent, which affinity may be derived mainly from the rubber-elastic polymer and/or the rubber elasticity-providing monomer units.
  • the resin (d) is still able to allow said various components or additives to thermally diffuse when heated at temperatures of 60° to 180° C.
  • the high-impact acrylic resin (d) to be used in the dry image forming material of the present invention may be a blend of at least one rigid thermoplastic acrylic polymer and at least one rubber-elastic polymer, or at least one copolymer comprising rigidity-providing acrylic monomer units and rubber elasticity-providing monomer units or a combination thereof with at least one rigid thermoplastic acrylic polymer and/or at least one rubber-elastic polymer.
  • the high impact acrylic resin (d) has an Izod impact strength (notched) of at least 0.4 ft.lb/in, usually 0.5 to 25 ft.lb/in, most practically 0.5 to 5 ft.lb/in, as measured in accordance with ASTM D 256.
  • the high impact acrylic resin (d) preferably contains 0.5 to 300 parts by weight, more preferably 5 to 200 parts by weight, of the rubber-elastic polymer and/or rubber elasticity-providing monomer units per 100 parts by weight of the rigid thermoplastic acrylic polymer and/or rigidity-providing acrylic monomer units.
  • the rigid thermoplastic acrylic polymer which preferably has a weight average molecular weight of 5,000 to 1,000,000, more preferably 10,000 to 500,000, may be an acrylic homopolymer of an unsubstituted or substituted C 1 -C 4 alkyl, cyclohexyl, C 6 -C 10 aryl, benzyl or tetrahydrofurfuryl ester of methacrylic acid or an acrylic copolymer comprising monomer units of at least one member selected from unsubstituted or substituted C 1 -C 6 alkyl, C 6 -C 10 aryl, benzyl or tetrahydrofurfuryl esters of methacrylic acid, and is desired to have a Rockwell hardness of M 75 to M 120, preferably M 80 to M 110.
  • the acrylic copolymer may contain up to about 10% by weight of acrylic acid and/or methacrylic acid monomer units.
  • the substituted alkyl, aryl, benzyl or tetrahydrofurfuryl group that may be contained in the abovementioned esters of methacrylic acid may be one substituted with a halogen, nitro, amino, hydroxy or a C 1 -C 4 alkoxy.
  • ester of methacrylic acid capable of forming the rigid thermoplastic acrylic polymer of either the homopolymer type or the copolymer type usable in a blend as the component (d) of the dry image forming material of the present invention
  • the rubber-elastic polymer that may be suitably used for blending with the rigid thermoplastic acrylic polymer or combining with the copolymer comprising rigidity-providing acrylic monomer units and rubber elasticity-providing monomer units to form a high impact acrylic resin (d)
  • polyurethanes there can be mentioned polyurethanes, styrene-butadiene copolymers, ethylene-vinyl acetate copolymers, polyacrylates and the like.
  • the rubber-elastic polymer is desired to have a glass transition temperature of at most 80° C., preferably -80° to 40° C., more preferably -60° to 10° C.
  • Polyacrylates are most preferred as the rubber-elastic polymer from the viewpoint of better impact peeling strength.
  • the rubber-elastic polyacrylates preferably comprise at least 5% by weight, more preferably at least 30% by weight, of monomer units of at least one unsubstituted or substituted C 1 -C 22 alkyl ester of acrylic acid, or at least 80% by weight, more preferably at least 90% by weight, of monomer units of at least one unsubstituted or substituted C 7 -C 22 alkyl ester of methacrylic acid (the above-specified lower limit of amount of the monomer units of said at least one alkyl ester of methacrylic acid can be lowered when said at least one alkyl ester of methacrylic acid is used in combination with said at least one alkyl ester of acrylic acid).
  • the substituted alkyl group that may be contained in the above-mentioned ester of acrylic acid or methacrylic acid may be one substituted with a halogen, amino, hydroxy, a C 1 -C 4 alkoxy or a di(C 1 -C 4 alkyl)amino.
  • Specific examples of the unsubstituted or substituted C 1 -C 22 alkyl ester of acrylic acid include methyl acrylate, propyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, 2-hydroxypropyl acrylate, diethylaminoethyl acrylate and dimethylaminoethyl acrylate.
  • unsubstituted or substituted C 7 -C 22 alkyl ester of methacrylic acid include 2-ethylhexyl methacrylate, lauryl methacrylate, tridecyl methacrylate and stearyl methacrylate.
  • the rubber-elastic polyacrylate may contain other monomer units selected from monomer units of at least one unsubstituted or substituted C 1 -C 6 alkyl, C 6 -C 10 aryl, benzyl or tetrahydrofurfuryl ester of methacrylic acid as mentioned before, styrene monomer units, ethylvinylbenzene monomer units, acrylonitrile monomer units, vinyl acetate monomer units, acrylic acid monomer units, maleic acid or anhydride monomer units and the like.
  • the rubber-elastic polyacrylate be partially crosslinked by incorporating thereinto up to 20% by weight, more preferably up to 5% by weight, of monomer units of at least one crosslinkable monomer selected from divinylbenzene, ethylene glycol diacrylate, ethylene glycol dimethacrylate, diethylene glycol diacrylate, diethylene glycol dimethacrylate, glycerin triacrylate, glycerin trimethacrylate, dipropylene glycol diacrylate, dipropylene glycol dimethacrylate, butylene glycol diacrylate, butylene glycol dimethacrylate, diallyl maleate, triallyl cyanurate and the like.
  • monomer units of at least one crosslinkable monomer selected from divinylbenzene, ethylene glycol diacrylate, ethylene glycol dimethacrylate, diethylene glycol diacrylate, diethylene glycol dimethacrylate, glycerin triacrylate, glycerin trimethacrylate, dipropy
  • the high impact acrylic resin (d) of the copolymer type which preferably has a weight average molecular weight of 5,000 to 1,000,000, more preferably 10,000 to 500,000, may comprise rigidity-providing monomer units of at least one ester of methacrylic acid as mentioned before as being capable of forming the rigid thermoplastic acrylic polymer of the homopolymer type and 0.5 to 300% by weight, based on the rigidity-providing monomer units, of rubber elasticity or flexibility-providing monomer units of at least one member selected from unsubstituted or substituted C 1 -C 22 alkyl esters of acrylic acid and unsubstituted or substituted C 7 -C 22 alkyl esters of methacrylic acid which are mentioned before as being capable of forming the rubber-elastic polyacrylate.
  • the high impact acrylic resin (d) may also be one prepared by polymerizing, in the presence of at least one copolymer comprising rigidity-providing monomer units and flexibility-providing monomer units of the kinds as mentioned above with respect to the high impact acrylic resin (d) of the copolymer type and/or at least one rubber-elastic polymer, at least one ester of methacrylic acid as mentioned before as being capable of forming a rigid thermoplastic acrylic polymer of the homopolymer type.
  • the acrylic resin (d) may comprise a block or graft copolymer though there remains a possibility that the resin (d) is a mere blend of said at least one copolymer and/or said at least one rubber-elastic polymer with a polymer formed from said at least one ester of methacrylic acid.
  • a monomer or monomers capable of copolymerizing with an ester of methacrylic acid which may be selected, for example, from vinyl acetate, styrene, acrylonitrile, acrylic acid and maleic acid or anhydride, may be used for partial replacement thereof for the ester or esters of methacrylic acid mentioned before as being capable of forming a rigid thermoplastic acrylic polymer.
  • the term "acrylic and/or methacrylic ester component" is intended to indicate all of monomer units of the acrylic and/or methacrylic ester type contained in the polymer or polymers constituting the acrylic resin (d).
  • additives of various kinds such as a lubricant, an anti-oxidizing agent, an ultraviolet absorbing agent and a colorant may be added to the high impact acrylic resin (d).
  • the image forming coating or layer of the dry image forming material of the present invention may be either of a single layer structure with a layer comprising all the components (a), (b) and (c) essential for image formation, or a multi-layer structure with two or more separate but contiguous layers which comprise, at least as a whole, the components (a), (b) and (c) essential for image formation and are capable of cooperating with one another for forming an image.
  • the high impact acrylic resin (d) may be included in the image forming coating and/or a protective layer if present.
  • the high impact acrylic resin (d) be contained in a layer containing the organic silver salt oxidizing agent (a) and preferably having a thickness of 0.5 to 200 ⁇ , more preferably 3 to 30 ⁇ , and/or in a lyer, if present, formed just on said layer containing the component (a), preferably containing the reducing agent (b) for silver ions and/or a toning agent and preferably having a thickness of 0.5 to 100 ⁇ , more preferably 0.5 to 20 ⁇ . It is more preferred that the acrylic resin (d) be contained in the latter layer.
  • the high impact or impact resistance-improved acrylic resin (d) may be used, either singly or in combination with other polymeric substance, as the binder material of the image forming coating and/or as the material of any protective layer of the dry image forming material of the present invention.
  • the acrylic resin (d) is preferably used in an amount of at least 3% by weight, more preferably at least 8% by weight, most preferably at least 40% by weight, based on the total of the acrylic resin (d) and the other polymeric substance. Natural or synthetic polymeric substances may be used as such other polymeric substance.
  • the other polymeric substance include polyvinyl butyral, cellulose acetate, polyvinyl acetate, cellulose acetate propionate, cellulose acetate butyrate, vinyl chloride-vinyl acetate copolymers, polyvinyl alcohol, polystyrene, polyvinyl formal and gelatin. They may be used either alone or in combination.
  • a binder consisting of the acrylic resin (d) and/or other polymeric substance is used in a layer containing the non-photosensitive organic silver salt oxidizing agent (a)
  • At least one polymeric substance such as polyvinyl butyral, polymethyl methacrylate, cellulose acetate, polyvinyl acetate, cellulose acetate propionate, cellulose acetate butyrate, a vinyl chloride-vinyl acetate copolymer, polyvinyl alcohol, polystyrene, polyvinyl formal or gelatin, may be used, without being combined with the acrylic resin (d), in one or more layers of the image forming material of the present invention, provided that the image forming material comprises the acrylic resin (d) in at least one layer thereof.
  • the image forming material comprises the acrylic resin (d) in at least one layer thereof.
  • polyvinyl butyral be used as the binder of a layer containing the non-photosensitive organic silver salt oxidizing agent (a) and having thereon a layer containing a blend of polymethyl methacrylate and a copolymer comprising alkyl acrylate monomer units as the main monomer units which blend constitutes the high impact acrylic resin (d) in the present invention, the latter layer preferably containing the reducing agent (b) and/or a toning agent.
  • silver salts of long chain fatty acids which preferably have 12 to 24 carbon atoms, are especially suitable.
  • Preferred examples of the silver salts of long chain fatty acids include silver behenate, silver stearate, silver palmitate, silver myristate, silver laurate and silver oleate.
  • organic silver salt oxidizing agents there can be mentioned, for example, the silver salts of saccharin, benzotriazole, 5-substituted salicylaldoxime such as 5-chloro or -nitro salicylaldoxime, phthalazinone, 3-mercapto-4-phenyl-1,2,4-triazole and perfluoroalkanesulfonic acids. They may be used either alone or in combination.
  • the organic silver salt oxidizing agent may be used in an amount of about 0.1 to about 50 g/m 2 , preferably 1 to 10 g/m 2 of the support area of the present image forming material.
  • a suitable reducing agent may be chosen depending on the organic silver salt oxidizing agent employed in combination therewith.
  • a silver salt of a long chain fatty acid such as silver behenate which is relatively hard to reduce
  • a relatively strong reducing agent e.g., a bisphenol such as 2,2'-methylenebis(4-ethyl-6-tert-butyl)phenol is suitably employed.
  • organic silver salt oxidizing agents such as silver laurate which are relatively easy to reduce are suitable relatively weak reducing agents; e.g., substituted phenols such as p-phenylphenol, and to organic silver salt oxidizing agents such as the silver salt of benzotriazole which are very hard to reduce are suitable strong reducing agents such as ascorbic acids.
  • the silver ion reducing agent that is especially suitable for the dry image forming material of the present invention is a hindered phenol in which one or two sterically bulky groups are bonded to the carbon atom or carbon atoms contiguous to the hydroxyl group-bonded carbon atom to sterically hinder the hydroxyl group.
  • the hindered phenol has high stability to light and, hence, the use of the hindered phenol is effective for assuring a high storage stability of the raw image forming material.
  • hindered phenols there can be mentioned 2,6-di-tert-butyl-4-methylphenol, 2,2'-methylenebis(4-methyl-6-tert-butylphenol), 2,2'-methylenebis(4-ethyl-6-tert-butylphenol), 1,1-bis(2-hydroxy-3,5-dimethylphenyl)-3,5,5-trimethylhexane, 2,6-methylenebis (2-hydroxy-3-tert-butyl-5-methylphenyl)-4-methylphenol, 2,2'-methylenebis[4-methyl-6-(1-methylcyclohexyl)phenol] and 2,5-di-tert-butyl-4-methoxyphenol.
  • reducing agents may be used either alone or in combination.
  • the amount of the reducing agent (d) to be used varies depending on the kinds of organic silver salt oxidizing agent, reducing agent and other components to be used in the dry image forming material of the present invention.
  • the suitable amount of the reducing agent is usually 0.1 to 3 moles per mole of the organic silver salt oxidizing agent.
  • the component (c) to be used in the dry image forming material of the present invention is a photosensitive silver compound or a photosensitive silver compound-forming component capable of forming a photosensitive silver compound by the reaction thereof with the organic silver salt oxidizing agent (a).
  • the photosensitive silver compound include silver halides such as silver chloride, silver bromide, silver bromoiodide, silver chlorobromide, silver chlorobromoiodide and silver iodide. They may be used either alone or in combination.
  • the photosensitive silver compound may be formulated, together with other components, into a composition for providing the image forming coating or layer of the dry image forming material, as usual in the field of photographic film manufacture.
  • Examples of the photosensitive silver compound-forming component include hydrogen halides such as hydrogen bromide and hydrogen iodide; metal halides such as sodium bromide, potassium bromide, calcium iodide, calcium bromide, barium iodide, lithium bromide, aluminum bromide, aluminum iodide, ferric bromide, zinc bromide, zinc iodide, cobaltous bromide, cobaltous iodide, lead iodide, lead bromide, mercuric bromide, mercuric iodide, nickel bromide, nickel iodide, palladium bromide, palladium iodide, cadmium bromide, cadmium iodide, magnesium bromide, manganese bromide and manganese iodide; halogen molecular species such as iodine, bromine and iodine bromide, and complexes of the halogen molecular
  • organic haloamides such as N-bromosuccinimide, N-bromoacetamide, N-bromophthalazinone, N-bromophthalimide and N,N-dibromobenzenesulfonamide (see U.S. Pat. No.
  • diarylhalomethanes such as ⁇ -bromodiphenylmethane, ⁇ -bromodi(p-nitrophenyl)methane, ⁇ -bromodi(p-methoxyphenyl)methane, ⁇ -bromodi(p-bromophenyl)methane, ⁇ -bromodi(p-methylphenyl)methane and ⁇ -bromodi(p-phenylphenyl)methane (see U.S. Pat. No.
  • onium halides such as benzyltrimethylammonium iodide, benzyltriethylammonium hydride and cetyltrimethylammonium bromide
  • organometallic halides such as triphenylphosphine dibromide, bis(p-anisyl)tellurium dibromide, diphenylgermanium dibromide, triphenylgermanium bromide, triphenyltin bromide and diphenylselenium dibromide (see U.S. Pat. No.
  • halogen molecular species and complexes thereof, organic haloamides, organometallic halides, diarylhalomethanes and combinations thereof are particularly useful as the photosensitive silver compound-forming component to provide a normally non-photosensitive dry image forming material which is rendered photosensitive by heating at an elevated temperature, by which heating the photosensitive silver compound-forming component is caused to react with part of the organic silver salt oxidizing agent to form the silver halide in an amount sufficient to render the image forming material photosensitive.
  • Either the photosensitive silver compound or the photosensitive silver compound-forming component is preferably used in an amount of 0.001 to 0.5 mole per mole of the organic silver salt oxidizing agent (a).
  • the representative examples of the anti-foggant include benzotriazole, mercury compounds such as mercury acetate and carboxylic acid anhydrides such as tetrachlorophthalic anhydride.
  • the anti-foggant is effective for preventing the dry image forming material of the present invention from bringing about so-called heat fogging which is a phenomenon that the unexposed portions of a dry image forming material are blackened by heating at the time of heat development.
  • the anti-foggant may be used in an amount of 0.005 to 10 mole %, based on the organic silver salt oxidizing agent (a).
  • the chemical sensitizing agent there can be mentioned, for example, triphenylphosphite, quinoline and N-methyl-2-pyrrolidone.
  • the background-darkening preventing agent there can be mentioned, for example, tetrabromobutane, hexabromocyclohexane,tribromoquinaldine and ⁇ , ⁇ , ⁇ ', ⁇ '-tetrabromo-o-xylene. They may be used in an amount of 2.5 to 40 mole %, based on the organic silver salt oxidizing agent (a).
  • the toning agent there can be mentioned, for example, phthalazinone, combinations of phthalazine with phthalic acid or phthalic anhydride, isocyanate-blocked phthalazinones, imidazole and 3-substituted 3-pyrazolin-5-ones (see Deutshe Offenlegungsschrift No. 2,934,751).
  • the preferred method of preparing the dry image forming material of this invention is described by way of example as follows.
  • An organic silver salt oxidizing agent is dispersed in a binder solution or emulsion by means of a sand grinder, a mixer, a ball mill or the like.
  • To the resulting dispersion are added the other components and optionally various additives.
  • the composition thus obtained is applied onto a support such as a plastic film, a glass plate, a paper or a metal plate, followed by drying in warm air or under room temperature, to prepare a dry image forming material.
  • the plastic film there can be mentioned a polyethylene film, a cellulose acetate film, a polyethylene terephathalate film, a polyamide film, a polypropylene film and the like.
  • the components of the composition may optionally be applied in two or more separate but contiguous layers.
  • the dry thickness of the heat-developable image forming coating or layer may be 1 to 300 ⁇ , preferably 3 to 50 ⁇ .
  • a protective layer preferably having a thickness of 0.2 to 20 ⁇ , more preferably 0.5 to 5 ⁇ , may be provided.
  • the material for the protective layer may be chosen from among the binder materials as mentioned hereinbefore.
  • the normally photosensitive image forming material can form thereon a visible image when subjected to imagewise exposure to light and heat development which is usually conducted at a temperature of about 80° to 200° C. for about 1 to 60 seconds.
  • the noramlly non-photosensitive image forming material of the present invention can form thereon a visible image when subjected to preliminary heat activation at a temperature of about 70° to 180° C. for about 1 to 60 seconds, imagewise exposure to light, and heat development which may be carried out in the same manner as described with respect to the normally photosensitive image forming material.
  • GPC gel phermeation chromatography
  • the impact peel strength of a dry image forming material between its base film and coating or coatings is examined according to the following procedures.
  • the dry image forming material is placed on a stainless steel plate in such a way that the base film is contacted with the plate. Only the tip of the hemisphere of a cylindrical bar with one end thereof machined to be hemispherical with a radius of curvature of 10 mm is contacted with the upper surface of the image forming material.
  • a stainless steel weight of 1 kg is dropped onto the other end of the cylindrical bar for a given falling distance. Whether or not any peeling between the base film and the coating or coatings has occurred is observed.
  • the impact peel strength of the image forming material is evaluated in terms of a minimum falling distance for which the weight is dropped to cause any peeling between the base film and the coating or coatings.
  • the Du Pont impact test is carried out with respect to the raw materials and the imaged materials (in some Examples and Comparative Examples) before and after subjected to accelerated deterioration, the conditions of which will be described later with respect to storage stability.
  • a raw image forming material is exposed to or stored under the following accelerated deteriorating conditions, and subjected to image formation which is carried out in the same manner as in Example 1 which will be given later.
  • the storage stability is evaluated in terms of the minimum optical density (O.D. min) of the imaged material.
  • image formation is carried out before and after the material is exposed to or stored under the following accelerated deteriorating conditions.
  • the dry image forming material is exposed through a 21 step steptablet (manufactured by Eastman Kodak Co., Ltd., U.S.A.) to light in an amount of 250,000 lux ⁇ seconds which light is emitted from a tungsten lamp, and heat-developed at 120° C. for 30 seconds in a dark room to form an image on the material.
  • the maximum optical density (O.D.max), minimum optical density (O.D.min) and optical density of the eighth densest image (O.D. 8 ) corresponding to the eighth step counted from the step located at the end of the steptablet and giving the maximum optical density to the negative image are measured.
  • the storage stability of the raw image forming material is evaluated by comparing the O.D.max, O.D.min and O.D. 8 of the material before stored with those of the material after stored under the above-mentioned accelerated deteriorating conditions.
  • the symbol (A) indicates the materials of the present invention and the symbol (B) indicates the comparative materials.
  • ingredients [I] as shown below were added to 1.5 g of the silver behenate suspension to form a silver behenate emulsion.
  • the silver behenate emulsion was uniformly applied onto a 100 ⁇ -thick polyethylene terephthalate film at an orifice of 100 ⁇ , and air-dried at room temperature (about 20° C.).
  • About 2 g of a reducing agent-containing composition composed of ingredients [II] as shown below was uniformly applied as a second coating layer onto the coating layer of the silver behenate emulsion at an orifice of 75 ⁇ , and air-dried at room temperature (20° C.) to obtain a normally non-photosensitive dry image forming material (A1) having a total coating layer thickness of about 18 ⁇ .
  • A1 normally non-photosensitive dry image forming material having a total coating layer thickness of about 18 ⁇ .
  • the preparation of this image forming material was conducted in a light room all the time.
  • Acrylic Resin (d-1) was a blend of polymethyl methacrylate and 40% by weight, based on the polymethyl methacrylate, of a rubber-elastic, partially-crosslinked copolymer obtained by the potassium persulfate-catalyzed emulsion polymerization, in water at 65° C. for 2 hours, of a mixture of 90% by weight of methyl acrylate and 10% by weight of 55% divinylbenzene (a mixture of 55% by weight of divinylbenzene and 45% by weight of ethylvinylbenzene).
  • the dry image forming material (A1) was preliminarily heated on a hot plate maintained at about 100° C. for 5 seconds in a dark room to render it photosensitive. Then, the material was exposed through a 21-step steptablet (manufactured and sold by Eastman Kodak Co., Ltd., U.S.A.) to light from a 300-watt tungsten lamp for 1 second. When the exposed material was heated on a hot plate maintained at about 120° C. for 5 seconds in a dark room, a black negative image was obtained.
  • Acrylic Resin (d-2) was a copolymer of 80% by weight of methyl methacrylate and 20% by weight of n-butyl acrylate.
  • a normally non-photosensitive dry image forming material (A3) was prepared in substantially the same manner as in Example 1 except that Acrylic Resin (d-3) was used instead of Acrylic Resin (d-1).
  • Acrylic Resin (d-3) was a 2:1 by weight blend of Acrylic Resin (d-1) as used in Example 1 and polymethyl methacrylate.
  • Comparative normally non-photosensitive dry image forming materials (B1), (B2), (B3) and (B4) were prepared in substantially the same manner as in Example 1 except that polymethyl methacrylate, cellulose acetate, a vinyl chloride-vinyl acetate copolymer (vinyl chloride/vinyl acetate: 70/30 by weight) and polystyrene, which are all conventional binder materials especially useful for an overcoating, were respectively used instead of Acrylic Resin (d-1).
  • ingredients [III] as shown below were added to 1.5 g of the silver behenate suspension to form a silver behenate emulsion.
  • the silver behenate emulsion was uniformly applied onto a 100 ⁇ -thick polyethylene terephthalate film at an orifice of 100 ⁇ , and air-dried at room temperature (about 20° C.).
  • About 2 g of a reducing agent-containing composition composed of ingredients [IV] as shown below was uniformly applied as a second coating layer onto the coating layer of the silver behenate emulsion at an orifice of 75 ⁇ , and air-dried at room temperature (20° C.) to obtain a normally photosensitive dry image forming material (A4) having a total coating layer thickness of about 18 ⁇ .
  • A4 normally photosensitive dry image forming material having a total coating layer thickness of about 18 ⁇ .
  • the preparation of this image forming material was conducted in a dark room all the time.
  • Acrylic Resin (d-4) was a polymer latex obtained by subjecting a mixture of 90 parts by weight of n-butyl acrylate, 10 parts by weight of methyl methacrylate and 0.6 part by weight of triallyl cyanurate to potassium persulfate-catalyzed emulsion polymerization in water at 70° C.
  • a latex solids content: about 33% by weight
  • a crosslinked acrylic elastomer and subsequently subjecting a mixture of 30.3 parts by weight of the crosslinked acrylic elastomer latex, 6 parts by weight of acrylonitrile, 12 parts by weight of styrene, 12 parts by weight of methyl methacrylate and 0.3 part by weight of ethylene glycol dimethacrylate to potassium persulfate-catalyzed emulsion polymerization at 70° C. for 2 hours.
  • the dry image forming material (A4) was allowed to stand at room temperature for one month in a dark room. Thereafter, the surface of the image forming material was observed by means of an optical microscope to find that no powdery deposit was present on the surface of the material (no chalking occurred).
  • Comparative normally photosensitive dry image forming materials (B5) and (B6) were prepared in substantially the same manner as in Example 4 except that polystyrene and cellulose acetate were respectively used instead of Acrylic Resin (d-4).
  • the dry image forming materials (B5) and (B6) were allowed to stand under the same conditions as in Example 4. The presence of a powdery deposit (occurrence of chalking) was observed on the surface of either of the image forming materials.
  • Example 4 It is apparent from Example 4 and Comparative Example 2 that the use of a high impact acrylic resin in the overcoating of a dry image forming material according to the present invention effectively suppresses the occurrence of chalking as compared with the use of conventional binder materials.
  • ingredients (V) as shown below were added to 20 ml of the silver behenate suspension to form a silver behenate emulsion.
  • the silver behenate emulsion was so applied onto a 100 ⁇ -thick transparent polyethylene terephthalate film support that the amount of silver behenate was 1.5 g per m 2 of the support, followed by drying.
  • a reducing agent-containing composition composed of ingredients [VI] as shown below was uniformly applied as a second coating layer onto the coating layer of the silver behenate emulsion, and air-dried at room temperature (20° C.) to obtain a normally photosensitive dry image forming material (A5) having a second coating layer thickness of about 10 ⁇ .
  • the preparation of this image forming material was conducted in a dark room all the time.
  • a normally photosensitive dry image forming material (A6) was prepared in substantially the same manner as in Example 5 except that Acrylic Resin (d-2) as used in Example 2 was used instead of Acrylic Resin (d-1).
  • a normally photosensitive dry image forming material (A7) was prepared in substantially the same manner as in Example 5 except that Acrylic Resin (d-5) was used instead of Acrylic Resin (d-1).
  • Acrylic Resin (d-5) was a polymer obtained by subjecting a mixture of 61.5 parts by weight of n-butyl acrylate, 13.5 parts by weight of styrene and 0.4 part by weight of butylene glycol diacrylate to potassium persulfate-catalyzed emulsion polymerization in water at 70° C. for 30 minutes to prepare a copolymer, polymerizing at 70° C.
  • Comparative normally photosensitive dry image forming materials (B7), (B8) and (B9) were prepared in substantially the same manner as in Example 5 except that polymethyl methacrylate, a vinyl chloride-vinyl acetate copolymer (vinyl chloride/vinyl acetate: 70/30 by weight) and cellulose acetate were respectively used instead of Acrylic Resin (d-1).
  • a normally non-photosensitive dry image forming material (A8) was prepared in substantially the same manner as in the preparation of the dry image forming material (B2) in Comparative Example 1 except that a mixture of 1.8 g of a 10 weight % solution of polyvinyl butyral in methyl ethyl ketone and 0.2 g of a 10 weight % solution of Acrylic Resin (d-4) as used in Example 4 in methyl ethyl ketone was used instead of 2.0 g of a 10 weight % solution of polyvinyl butyral in methyl ethyl ketone which solution was used in the composition for the coating layer containing silver behenate (non-photosensitive organic silver salt oxidizing agent) in Comparative Example 1.
  • a comparative normally photosensitive dry image forming material (B10) was prepared in substantially the same manner as in Example 9 except that a vinyl chloride-vinyl acetate copolymer (vinyl chloride/vinyl acetate: 70/30 by weight) was used as the material of a protective layer instead of Acrylic Resin (d-4).
  • the image forming material (A9) according to the present invention is very small in changes of O.D.max, O.D. 8 and O.D.min under the accelerated deteriorating conditions and, hence, has an excellent storage stability as compared with the comparative image forming material (B10).
  • a normally non-photosensitive dry image forming material (A10) was prepared in substantially the same manner as in Example 1 except that Acrylic Resin (d-6) was used instead of Acrylic Resin (d-1).
  • Acrylic Resin (d-6) was a blend of polymethyl methacrylate and 40% by weight, based on the polymethyl methacrylate, of Tufprene A (trade name of a stryene-butadiene block copolymer manufactured by Asahi Kasei Kogyo Kabushiki Kaisha, Japan).
  • Tufprene A trade name of a stryene-butadiene block copolymer manufactured by Asahi Kasei Kogyo Kabushiki Kaisha, Japan.
  • a normally non-photosensitive dry image forming material (A11) was prepared in substantially the same manner as in Example 1 except that Acrylic Resin (d-7) was used instead of Acrylic Resin (d-1).
  • Acrylic Resin (d-7) was a blend of polymethyl methacrylate and 40% by weight, based on the polymethyl methacrylate, of a rubber-elastic, partially-crosslinked copolymer obtained by the potassium persulfate-catalyzed emulsion polymerization, in water at 60° C. for 2 hours, of a mixture of 90% by weight of methyl acrylate and 10% by weight of dipropylene glycol dimethacrylate.
  • a comparative normally non-photosensitive dry image forming material (B11) was prepared in substantially the same manner as in Example 1 except that Tufprene A as used in Example 10 was used instead of Acrylic Resin (d-1).
  • Normally non-photosensitive dry image forming materials (A12), (A13), (A14), (A15), (A16), (A17) and (A18) were prepared in substantially the same manner as in Example 1 except that blends of a styrene-n-butyl acrylate copolymer (h) and polymethyl methacrylate (the blends have varied blending weight ratios as listed in Table 6 which will be given later) were respectively used instead of Acrylic Resin (d-1).
  • the above-mentioned copolymer (h) was one obtained by stirring under an atmosphere of nitrogen at 80° C. for 2 hours a mixture of 40 parts by weight of styrene, 10 parts by weight of n-butyl acrylate, 1 part by weight of azobisisobutyronitrile and 50 parts by weight of toluene to effect free radical polymerization and removing the toluene from the reaction mixture under reduced pressure.
  • the comparative dry image forming materials (B1) and (B4) prepared in Comparative Example 1 were subjected to accelerated deterioration under the same conditions as in Example 12.
  • a normally non-photosensitive dry image forming material (A19) was prepared in substantially the same manner as in Example 1 except that Acrylic Resin (d-8) was used instead of Acrylic Resin (d-1).
  • Acrylic Resin (d-8) was a blend of 50% by weight of polymethyl methacrylate and 50% by weight of a product which had been obtained by subjecting a mixture of 30 parts by weight of methyl methacrylate and 0.05 part by weight of diallyl maleate to potassium persulfate-catalyzed emulsion polymerization in water at 65° C. for 2 hours to form a first polymer emulsion, subjecting a mixture of all the first polymer emulsion, 40.5 parts by weight of n-butyl acrylate, 9.5 parts by weight of styrene and 1 part by weight of diallyl maleate to potassium persulfate-catalyzed emulsion polymerization at 70° C.
  • a normally non-photosensitive dry image forming material (A20) was prepared in substantially the same manner as in Example 1 except that a 10 weight % solution of Acrylic Resin (d-2) as used in Example 2 in methyl ethyl ketone was used instead of the 10 weight % solution of polyvinyl butyral in methyl ethyl ketone in the ingredients [I].
  • Example 2 To 1.5 g of a silver behenate suspension as prepared in Example 1 were added ingredients [VIII] as shown below to form a silver behenate emulsion.
  • the silver behenate emulsion was uniformly applied onto a 100 ⁇ -thick polyethylene terephthalate film at an orifice of 100 ⁇ , and air-dried at room temperature (about 20° C.) to obtain a normally non-photosensitive dry image forming material (A21) having a coating layer thickness of about 11 ⁇ .
  • A21 normally non-photosensitive dry image forming material having a coating layer thickness of about 11 ⁇ .
  • the preparation of this image forming material was conducted in a light room all the time.
  • the O.D.min of the imaged material (A21) after subjected to the accelerated deterioration was 0.10.
  • dry image forming materials which comprises a high impact acrylic resin in accordance with the present invention are greatly improved over and compare very much favorably with conventional dry image forming materials in respect of impact peel strength, chalking resistance and storage stability of raw material.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
US06/203,034 1979-11-09 1980-11-03 Dry image forming material Expired - Lifetime US4327176A (en)

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JP54144333A JPS5913728B2 (ja) 1979-11-09 1979-11-09 乾式画像形成材料
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JP (1) JPS5913728B2 (enrdf_load_stackoverflow)
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BE (1) BE886046A (enrdf_load_stackoverflow)
CA (1) CA1148012A (enrdf_load_stackoverflow)
DE (1) DE3042331A1 (enrdf_load_stackoverflow)
FR (1) FR2469740B1 (enrdf_load_stackoverflow)
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JPS62135827A (ja) * 1985-12-09 1987-06-18 Konishiroku Photo Ind Co Ltd 熱現像カラ−感光材料
JPH01166133U (enrdf_load_stackoverflow) * 1988-04-27 1989-11-21
WO1994025900A1 (en) * 1993-04-26 1994-11-10 Minnesota Mining And Manufacturing Company Photothermographic elements
DE69621337T2 (de) * 1995-07-18 2002-11-21 Agfa-Gevaert, Mortsel Photothermographisches aufzeichnungsmaterial
JP3783989B2 (ja) * 1997-09-09 2006-06-07 富士写真フイルム株式会社 熱現像画像記録材料
US6063559A (en) * 1997-09-17 2000-05-16 Agfa-Gevaert Amino-triazine compounds for (photo)thermographic materials
US6153372A (en) * 1997-10-03 2000-11-28 Fuji Photo Film Co., Ltd. Photothermographic element
JPH11295845A (ja) * 1998-04-08 1999-10-29 Fuji Photo Film Co Ltd 熱現像感光材料

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US3457075A (en) * 1964-04-27 1969-07-22 Minnesota Mining & Mfg Sensitized sheet containing an organic silver salt,a reducing agent and a catalytic proportion of silver halide
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US3706565A (en) * 1970-10-28 1972-12-19 Eastman Kodak Co Photographic compositions containing an admixture of organic and inorganic silver salts
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AU6418180A (en) 1981-05-14
DE3042331C2 (enrdf_load_stackoverflow) 1988-07-14
AU535681B2 (en) 1984-03-29
FR2469740A1 (fr) 1981-05-22
GB2063500B (en) 1983-07-13
JPS5913728B2 (ja) 1984-03-31
JPS5667841A (en) 1981-06-08
CA1148012A (en) 1983-06-14
FR2469740B1 (fr) 1986-12-26
GB2063500A (en) 1981-06-03
DE3042331A1 (de) 1981-05-27

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